#include<stdio.h>
#include<string.h>
int main()
{
	FILE *fp = fopen("log.txt","w");
	if(fp == NULL)
	{
		perror("fopen");
		return 1;
	}

	const char * msg = "hello lqy";
	int cnt =1;
	while(cnt <= 10)
	{
		char buffer[1024];
		snprintf(buffer,sizeof(buffer),"%s%d\n",msg,cnt++);
		fwrite(buffer,strlen(buffer),1,fp);
	}
	fclose(fp);
	return 0;
}
